condition mean min max ZT0-3 22.75 22.75 22.75 ZT4-7 21.4 21.4 21.4 ZT8-11 28.3 28.3 28.3 ZT12-15 30.700000000000003 30.700000000000003 30.700000000000003 ZT16-19 84.65 84.65 84.65 ZT20-23 63.7 63.7 63.7